https://mail.gnome.org/archives/commits-list/2014-February/msg01490.html
[gnome-calculator] Do not attempt to set a nonexistant window icon
do notset agnomecalculatorattempt
https://bugzilla.mozilla.org/show_bug.cgi?id=29224
29224 - nonexistant pages added to history and displayed in URL bar
VERIFIED (radha) in Core - DOM: Navigation. Last updated 2008-07-31.
pagesadded